George Burgess'

Sterlo slams underperforming Burgess twins

The Rabbitohs duo have never hit the same heights as brother Sam with many believing they've under performed in seasons gone by.

Sterling as perplexed as anyone as to why they haven't stepped up.

"It's one of the real mysteries, that George and Tom haven't gone and hit the heights that I think we all thought they were going to after that standout season when they won the competition," he said on Triple M .